如何在剃刀视图中设置@model.attribute? [英] How to set @model.attribute in razor view?

问题描述

我有一个必填字段，字符串属性{get;set} 在一个类中，并希望在 razor 中设置它的值.像下面这样的事情可能吗?

I have a required field, string attribute{get; set} in a class and want to set it's value in razor. Is something like the following possible?

@model.attribute = "whatever'

推荐答案

首先，大小写很重要.

@model(小写m")是 Razor 视图中的保留关键字，用于在视图顶部声明模型类型，例如:

@model (lowercase "m") is a reserved keyword in Razor views to declare the model type at the top of your view, e.g.:

@model MyNamespace.Models.MyModel

在文件的后面，您可以使用@Model.Attribute(大写M")引用您想要的属性.

Later in the file, you can reference the attribute you want with @Model.Attribute (uppercase "M").

@model 声明模型.Model 引用模型的实例化.

@model declares the model. Model references the instantiation of the model.

第二，您可以为模型分配一个值并稍后在页面中使用它，但是当页面提交给您的控制器操作时它不会持久化，除非它是表单字段中的值.为了在模型绑定过程中将值取回模型中，您需要将值分配给表单字段，例如:

Second, you can assign a value to your model and use it later in the page, but it won't be persistent when the page submits to your controller action unless it's a value in a form field. In order to get the value back in your model during the model binding process, you need to assign the value to a form field, e.g.:

选项 1

在您的控制器操作中，您需要为页面的第一个视图创建一个模型，否则当您尝试设置 Model.Attribute 时，Model 对象将是空.

In your controller action you need to create a model for the first view of your page, otherwise when you try to set Model.Attribute, the Model object will be null.

控制器:

// This accepts [HttpGet] by default, so it will be used to render the first call to the page
public ActionResult SomeAction()
{
    MyModel model = new MyModel();
    // optional: if you want to set the property here instead of in your view, you can
    // model.Attribute = "whatever";
    return View(model);
}

[HttpPost] // This action accepts data posted to the server
public ActionResult SomeAction(MyModel model)
{
    // model.Attribute will now be "whatever"
    return View(model);
}

查看:

@{Model.Attribute = "whatever";} @* Only do this here if you did NOT do it in the controller *@
@Html.HiddenFor(m => m.Attribute); @* This will make it so that Attribute = "whatever" when the page submits to the controller *@

选项 2

或者，由于模型是基于名称的，您可以跳过在控制器中创建模型，而只需将表单字段命名为与模型属性相同的名称.在这种情况下，将名为Attribute"的隐藏字段设置为whatever"将确保当页面提交时，值whatever"将在模型绑定过程中绑定到模型的 Attribute 属性.请注意，它不必是隐藏字段，只需带有 name="Attribute" 的任何 HTML 输入字段即可.

Or, since models are name-based, you can skip creating the model in your controller and just name a form field the same name as your model property. In this case, setting a hidden field named "Attribute" to "whatever" will ensure that when the page submits, the value "whatever" will get bound to your model's Attribute property during the model-binding process. Note that it doesn't have to be a hidden field, just any HTML input field with name="Attribute".

控制器:

public ActionResult SomeAction()
{
     return View();
}

[HttpPost] // This action accepts data posted to the server
public ActionResult SomeAction(MyModel model)
{
    // model.Attribute will now be "whatever"
    return View(model);
}

查看:

@Html.Hidden("Attribute", "whatever");

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